不是so far as,而是so long as正确!!
句子意思是:只要你把字典保持干净,你就可以借它。
so long as 或 as long as 表示“只要”,如:
I can come so/as long as I can leave by 4.00. (只要我能四点离开,我就可以来。)
so far as 或 as far as 表示“就……”或“达到……程度”,如:
He isn't coming today, so/as far as I know. (据我所知,他今天不来了。)
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